Network+ (plus) Performance Based Question

Network+ (plus) Performance Based Question for exam N10-008

This Network+ (plus) Performance Based Question falls under CompTIA Exam Objective 3.4 “Given a scenario, use the appropriate tool.”

The Scenario

In this PBQ, you need to configure your firewall based on the instructions provided. This is how the scenario is specified:

“You want your webserver to have complete Internet capability and permit FTP traffic only on its default ports. In the network diagram shown deploy the rules that would be added or modified on your firewall to accomplish this. Drag and drop the labels into their respective fields.  A label may be used more than once, and all fields may or may not have an appropriate label.”

The Answer

To accomplish this, we will add the rules to the external firewall as follows:

Allow – TCP– 21 > this allows standard FTP communication with the Webserver on port 21.  TCP is specified because it is connection-oriented making it more reliable than UDP.

Allow – TCP – 20 > this rule supports the data transfer over an FTP connection.  Again, TCP is specified based on its reliability.

Allow – TCP/UDP – 80 > this allows standard Internet traffic to the Webserver on port 80.

Allow – TCP/UDP – 443 > this allows secure Internet traffic (HTTPS) to the Webserver on port 443. TCP guarantees the delivery of each packet, so you can say that TCP provides reliability while UDP offers speed.

The Explanation

TCP guarantees the delivery of each packet. UDP does not provide any such capability making it much faster than TCP but not as reliable.

Live video streams will use UDP, and the client may experience some slight dropouts or loss of quality in the audio/video feed and when packets are dropped, and the data is lost. If packet loss is not tolerable, TCP will buffer the transmission and request retransmission of any dropped packets before delivery. This may cause a slight delay but provides an advantage for media streaming applications like “On Demand”. You will often find TCP and UDP used in conjunction with each other. Zoom is a good example where TCP initiates your connection and UDP ports establish outbound connections to support the session without firewall configuration.

When you’re finished, we will use the answer button in the top navigation panel to check our response.

You can see that it’s correct and all the rules have been added properly.  The rules can be added in any order as long as there’s no deny rule that would affect them.

Be careful! You don’t save your work the same way in a PBQ as in an MCQ

An important note is that, just like you will have to do at the actual examination, you must in CertBlaster click Submit to save and record your response to any PBQ.  It’s not enough to just click Next. The reason that has tripped some candidates is that the vast majority of questions on the Network+ exam are MCQ and for those, clicking Next both saves your answer and takes you to the next question. Not so for the PBQs, on those, unless you click Submit before hitting Next, your work will be lost and therefore not graded! Be very aware of this fact on your Network+ exam and any CompTIA exam that includes PBQs.

After clicking Submit to record your response, you will get a confirmation that your answer has been submitted (this is true both at the actual exam and in CertBlaster). It’s now, and only now, safe to click Next.

We hope this walk-through of a Network+ (plus) Performance Based Question adds to your understanding of what to expect at the Network+ exam.

Additional resources

Click here to access a free practice test consisting of MCQs for Network+ N10-008

Click here for a free online Network+ Study Guide

Click here to access the official CompTIA Exam Objectives for Network+ exams N10-007 and/or N10-008.

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